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Longman Dictionary of Contemporary English
impair
verb
COLLOCATIONS FROM OTHER ENTRIES
affect/impair your hearing (=make your hearing worse)
▪ Listening to loud music will eventually impair your hearing.
impaired (=having problems with hearing)
▪ There are about 11,000 people in the UK whose sight and hearing are both severely impaired.
COLLOCATIONS FROM CORPUS
■ ADVERB
mentally
▪ I know I am not alone in having a close relative who is mentally impaired.
▪ When the judge asked whether he was mentally impaired, Kaczynski replied no.
▪ The old lady was not mentally impaired on first impression.
▪ Those that produce small amounts of the protein are less mentally impaired.
seriously
▪ The child who does not learn to ask is seriously impaired in later life.
▪ But diligently studying by day and by night Seriously impair his tender eyesight.
▪ However, these internal timbers should not be cut or removed, otherwise the strength of the roof will be seriously impaired.
▪ If this is not done then defence against the hazards or management of the risk arising from them can be seriously impaired.
severely
▪ Acute schizophrenia can severely impair mothering skills when maternal distress leads to distraction and neglect.
▪ If renal function is severely impaired, acetazolamide is ineffective.
▪ Part of the problem is that they are often on tasks that are also severely impaired after destruction of primary visual cortex.
▪ Such a large amount of excess capacity must severely impair the effective functioning of the accelerator.
visually
▪ Eve insisted that visually impaired visitors were allowed to keep the Braille guidebooks and would always replace them free of charge.
■ NOUN
ability
▪ Poor notation can impair the ability of a scheme to accommodate new subjects and can hinder effective retrieval.
▪ I explained to the best of my impaired ability, but it was clear that the President was disappointed in me.
▪ They act on him and impair his ability to distinguish between thought and perception, between concepts and objects.
efficiency
▪ I have already explained how debris such as brambles impairs a net's efficiency.
▪ This impairs the efficiency of the braided shield and renders the cable open to interference.
▪ Care needs to be taken to ensure that regulation does not impair the efficiency of the financial system.
▪ Cleaning up Britain does not require international action, involve huge public expenditure, or impair the efficiency of industry.
function
▪ Addition of this phosphate group impairs the function of the essential protein, and viral protein synthesis fails to begin.
▪ Not only do sleeping pills impair the function of sleep, they also affect the way you feel the next day.
▪ Drowsiness, impaired cognitive function, and impotence may be a problem with higher doses.
▪ When gouty patients are found to have impaired renal function, they should be evaluated carefully for other causes of renal damage.
health
▪ A target for reduced hospital waiting lists, for example, may - by reducing hospital stays - actually impair patients' health.
performance
▪ Treat it with respect through - hitting scenery and objects costs time, and eventually impairs your vehicle's performance.
▪ Are you fitting anything which may be potentially dangerous or impair the performance of items such as brakes, steering, etc.?
▪ Loud noise impairs performance on the five-choice serial reaction time task in normal, rested subjects.
▪ Finally, tracks and poles will benefit from regular attention as dust and dirt will impair their performance.
■ VERB
hear
▪ The development of an effective network arrangement to create and evaluate materials and technology needed for hearing impaired learners. 2.
▪ Bell had a more than casual interest in this, for he himself was hearing impaired.
PHRASES FROM OTHER ENTRIES
visually impaired
Visually impaired people have as much right to full access to educational courses as anyone else.
▪ Instructions can also be obained in Braille for the visually impaired.
▪ An important part of this work is the provision of cash grants to visually impaired people in need.
▪ Braille Stark black controls and print against a white finish help the visually impaired to identify the controls.
▪ Eve insisted that visually impaired visitors were allowed to keep the Braille guidebooks and would always replace them free of charge.
▪ For example, in one case, an employer refused to hire a visually impaired applicant for the position of research analyst.
▪ It is, of course, necessary to check carefully and individually the size of type that a visually impaired pupil can discriminate.
▪ Special facilities include a lift to all floors in Inverleith House Gallery and a trail for the visually impaired.
EXAMPLES FROM OTHER ENTRIES
▪ Alcohol significantly impairs your ability to drive a car or operate machinery.
▪ If a witness is allowed to withhold evidence, it impairs the legal process.
▪ The amount of alcohol he had drunk seriously impaired his ability to drive.
EXAMPLES FROM CORPUS
▪ A lifetime spent with walking horses has permanently impaired his speech.
▪ But as the subject's brain function becomes increasingly impaired these movements become more and more erratic.
▪ Cons: A great way to temporarily impair gastrointestinal processes to the discomfort of others.
▪ Making new memories is even more impaired.
▪ Moreover, memory may be impaired for a variety of reasons, lack of initial attention is not the only possible explanation.
▪ Profit figures become merely amounts which can be spent without impairing initial capital invested.
▪ Treat it with respect through - hitting scenery and objects costs time, and eventually impairs your vehicle's performance.
The Collaborative International Dictionary
Impair

Impair \Im*pair"\, v. t. [imp. & p. p. Impaired; p. pr. & vb. n. Impairing.] [Written also empair.] [OE. empeiren, enpeiren, OF. empeirier, empirier, F. empirer, LL. impejorare; L. pref. im- in + pejorare to make worse, fr. pejor worse. Cf. Appair.] To make worse; to diminish in quantity, value, excellence, or strength; to deteriorate; as, to impair health, character, the mind, value.

Time sensibly all things impairs.
--Roscommon.

In years he seemed, but not impaired by years.
--Pope.

Syn: To diminish; decrease; injure; weaken; enfeeble; debilitate; reduce; debase; deteriorate.

Impair

Impair \Im*pair"\, v. t. To grow worse; to deteriorate.
--Milton.

Impair

Impair \Im"pair\, a. [F. impair uneven, L. impar; im- not + par equal.] Not fit or appropriate. [Obs.]

Impair

Impair \Im*pair"\, n. Diminution; injury. [Obs.]

Douglas Harper's Etymology Dictionary
impair

late 14c., earlier ampayre, apeyre (c.1300), from Old French empeirier (Modern French empirer), from Vulgar Latin *impeiorare "make worse," from assimilated form of in- "into, in" (see in- (2)) + Late Latin peiorare "make worse" (see pejorative). In reference to driving under the influence of alcohol, first recorded 1951 in Canadian English. Related: Impaired; impairing.

Wiktionary
impair
  1. (context obsolete English) Not fit or appropriate. v

  2. 1 (context transitive English) To weaken; to affect negatively; to have a diminishing effect on. 2 (context intransitive archaic English) To grow worse; to deteriorate.

WordNet
impair
  1. v. make worse or less effective; "His vision was impaired"

  2. make imperfect; "nothing marred her beauty" [syn: mar, spoil, deflower, vitiate]

Usage examples of "impair".

Assimilative debility is indicated by an impaired digestion and a consequent suppression, or an abnormal state of the secretions.

It matters not whether he is professional or amateur, so he is untouched by academicism and has not done so much reading or writing as to impair his mental digestion and his clarity of vision.

The nostrums advertised extensively over the country as specifics for this disease, while they may, in some instances, prevent the attacks for a short time, irritate the stomach, impair digestion, lower vitality, and permanently injure the system, often rendering the disease incurable.

After a while his organs had begun to degenerate, depleted calcium levels had reduced his bones to brittle porcelain sticks, muscles had atrophied, and fluid bloated his tissues, impairing his lungs, degrading his lymphatic system.

Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility.

Thus a contract made by the governor pursuant to a statute authorizing the appointment of a commissioner to conduct, over a period of years, a geological, mineralogical, and agricultural survey of the State, for which a definite sum had been authorized, was held to have been impaired by repeal of the statute.

This, as with barbiturates, is extremely dangerous when taken, if the user is infected or impaired.

Great pains are taken to obtain the materials at the right season of the year, properly cured so that none of their remedial qualities may be impaired.

Just as Mister Chicago predicted, a handful of deadheads came out of their fugue with their minds severely impaired, their personalities little changed from the way they had been before they were taken off the drugs.

The author exhibited a series of eighteen inks which had either been made with metallic iron or with which metallic iron had been immersed, and directed attention to the fact that though the depth and body of color seemed to be deepened, yet in every case the durability of writings made with such inks was so impaired that they became brown and faded in a few months.

And Boutins, in 1769, published an account of the diseases common to the East Indies, in which he stated that when Rice is eaten more or less exclusively, the vision becomes impaired.

Alton is endangering his life, or materially impairing his health, I wish it mitigated as far as it can be consistently with his safe detention.

In consequence the pulse grows small and weak, and the patient cannot exercise or labor as usual, and finally the lower limbs begin to swell, then the face and body, the skin looks dusky, the appetite is impaired, the kidneys become diseased, there is difficulty in breathing, and the patient, it is said, dies of dropsy, yet dropsy was the result of a disease of the heart, which retarded the circulation and enfeebled the system, and which was actually the primary cause of death.

Its only conflict with euthenics appertains to such euthenic measures as impair the adaptability of the race to the better environment they are trying to make.

An impaired hypothalamic hormone secretion led to an inadequate gonadotrophic secretion, which in turn blocked ovulation .